I have them, I do like them but find they come up small, athough I do have big horses.
The size large, 3, is too small for my 16.2hh WB, and the extra large, 4, is too small for my 17.3hh WB, yet too long for my 16.2hh, if they went up to a size 5 they would be perfect!
I think they look very smart though and are great for schooling if you dont want something as restrictive as brushing boots.
they are excellent, i love mine! my horse brushes really badly and they protect him well. iv got a 16,2 tb and he has size 2 on his fronts and size 3 behind.